Which planet has a large moon with retrograde motion?
a. Jupiter
b. Saturn
c. Uranus
d. Neptune
d
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Name the primary and secondary colors of the additive theory of light
A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west, and the total acceleration of the car is 2.5 m/s2 53° north of west. Which of the following is correct?
A. R = 0.29 km, and the car's speed is increasing. B. R = 0.23 km, and the car's speed is decreasing. C. R = 0.23 km, and the car's speed is increasing. D. R = 0.29 km, and the car's speed is decreasing. E. R = 0.29 km, and the car's speed is constant.
Which of following statements about the image formed by a single concave lens are true? (There could be more than one correct choice.)
A) The image is always real. B) The image is always virtual. C) The image is always inverted. D) The image is always upright. E) The image is always smaller than the object.
Choose the correct statement
a. The perceived pitch of a sound usually doesn't depend on the sound's frequency. b. The frequency of each musical note is 10 Hz higher than that of the next lower note. c. The decibel is the standard measure of tone quality. d. The perceived loudness of a sound depends somewhat on frequency.